Sirius never exactly specified how he was going to help Remus into the water. But from where Remus was sitting and he was standing, it seemed like a good idea to pick Remus up. Sliding one arm under his legs, and another around Remus's waist, Sirius lifted him up and eased him into the water, grinning all the while. "Feels good, doesn't it?"
Sirius didn't specify what 'it' was either – the water, or holding Remus in his arms when they were both wet and slippery.